New Aquarium Issues

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Hello! I'm a newbie here with my first saltwater aquarium. I'm a few months in and thought things had been going great, but now I'm not so sure.

For some background, I have a brand new 29 gallon tank. I let it cycle for about 6 weeks. I was getting zero ammonia readings by about 4 weeks, but let it go another 2 just to be sure. The only oddity is that I was never getting nitrate readings. Ammonia would briefly increase shortly after adding some food, then drop back to 0. No ammonia, no nitrites, no nitrates. I started with a pair of ocellaris clowns. For a cleanup crew, I have 2 peppermint shrimp, 5 small hermit crabs, and two recently added cerinth snails. I lost the first few snails I tried to add, but I think I was too impatient in acclimating them. I was more patient with the newest two, and they seem to be doing well when I actually see them. Those first few snails are the only casualties I've had. Things were quite stable for a solid 4 weeks, so I decided to add 2 bangai cardinal fish. While I had them in quarantine, I started seeing a few low-level ammonia readings that weren't going down on their own. I did water changes and added a dose of ammonia detoxifier to be safe. I added the cardinal fish about a week ago. My ammonia readings have continued to slowly increase. I had been doing weekly 25% water changes. With the increasing ammonia, I've switched to 50% water changes, but ammonia levels continue their slow crawl upwards. I know that the detoxifier doesn't remove ammonia, just makes it safe for the fish until it can be removed by the biological filter, but my bio filter either isn't removing it, or isn't removing it fast enough. I'm also now seeing some low levels of nitrites and nitrates popping up. I've even been adding doses of those bacterial starter cultures, and stuffed all the excess space in my filters with ammonia-specific filter floss, but they don't seem to make any difference I can see.

Some specs- 29 gallon tank, fish only with live rock, no corals.
2 filters, one HOB and one canister. Each rated for 30 gallons.
About 15 pounds of live rock (I know this is low. I've been slowly increasing it as my budget allows. I added another 2 pounds or so of cultured live rock with the cardinalfish. From the LFS, never left out of water. I also added a few dead rocks hoping to culture them along the way).
I also started with bagged, supposedly live sand. About 2-3 inches on the bottom.
Temp always consistent at 78 degrees F
Latest API ammonia reading was 2 ppm, but I have that little badge that is supposed to measure as well showing ~0.2 ppm. I don't know which to believe.
Specific gravity about 1.023 at last reading. Never outside of the 1.022 to 1.024 range.
pH about 8.3

I feed a variety of small pellets, newly hatched live baby brine shrimp, and frozen. I feel like I'm being careful about how much I feed. To the point that I worry about my clean up crew having enough to eat. With the pellets, I feed just a few at a time. The clowns won't eat them off the ground, so I never allow more than 2-3 tiny pellets to get past them (and the shrimp are usually on them pretty quickly). With the frozen cubes, I feed just a couple droppers worth. The clowns and shrimp know what the dropper is and come to it so I can feed them pretty directly. The cardinalfish are still wary of it, so I have been a bit more messy with feeding to make sure they're getting some. The only food I feel I could be over doing is the live baby brine shrimp. I have a little hatchery that I use. To feed, I suck them up with the dropper, turn off the filters and powerhead for a few minutes, and drop them in. The clowns and cardinalfish absolutely love them, and I enjoy watching them eat them. They're so tiny that I feed quite a bit, but they are always all but gone to the eye within 10 minutes or so, when I turn the filters and powerhead back on.

The fish are all bright, active, and have great appetites, but I'm worried that's going to change very soon with this downward spiral. They don't seem to be breathing heavily to me, but I admit the few videos I've watched to try and distinguish normal from heavy don't seem all that different to me. I've gotten rather attached to my little clownfish. Any advice or thoughts on what else I can try would be greatly appreciated. Thanks!
 
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I think the tank is too small for all those fish and cuc personally, with such little water volume the ammonia will increase quite fast,
 
Thank you both for your replies!

I was under the impression that cuc don't add much to the bioload of a tank. Do you think I've overdone it with them? I was mostly wanting to make sure any uneaten food would be taken care of and not left unfound.

Is one small fish per ~7.5 gallons considered overstocked in the marine world? I grew up with freshwater tanks, and while I know marine needs are higher, I thought this was pretty fair. I did plan to stop where I am with fish, but it just felt a bit empty with only the two clowns. I also noticed the ammonia beginning to return before I added the bangaii cardinals, though I'm sure they didn't help the situation.


The faulty test results idea is interesting, I hadn't considered that. Any idea how that could happen? Contamination in the bottles or something? Or something in the tank reading as ammonia that isn't? Would you recommend I go buy a new test kit and see if I'm still having the same readings?
 
What type of water do you use ? RODI , tap ? Probly increased bioload quickly and bacteria was cycled but not in large enough numbers to support all livestock maybe get some prime
 
I've been using RODI water. Sorry, I should have specified that!
 
Is one small fish per ~7.5 gallons considered overstocked in the marine world? I grew up with freshwater tanks, and while I know marine needs are higher, I thought this was pretty fair. I did plan to stop where I am with fish, but it just felt a bit empty with only the two clowns. I also noticed the ammonia beginning to return before I added the bangaii cardinals, though I'm sure they didn't help the situation.
There is not really a difference between the marine and freshwater worlds in this sense. It has never been about how many fish per aquarium, but how much space the fish in total would occupy and whether they would get along.

Clownfish can get to 3" easy, if not more. Similar size fish in freshwater aquariums would also need the same amount of space.

With that said, I don't think you are overstocked for that size tank, at least not now. Once the clownfish gets to its final size, you'll see that the pair fills out the tank very nicely, along with the cardinals. The clownfish likely will get territorial, and may try to fight the cardinals. Which, given the tank size, won't have anywhere to run.

So yeah, it may not seem like it is overstocked right now (and purely based off the sizes of fish right now, I guess it is not overstocked), but in the future that may be a different story.

Though personally I would risk it, if it feels tempting enough. XD
 
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You seem well informed and your post is well written so thanks for that.
Better surface agitation and flow will help with oxygen levels in the tank.
I would double the size of the HOB. In my experience, they are rated at half what they say.
Bottle of liquid bacteria wouldn't hurt here either. Be cool, monitor do your water changes.
I use a couple of the API test kits sparingly. Never the ammonia test-it sucks. Just too hard to read and not accurate.
Have your water tested elsewhere-LFS or friend who don't use API.
Welcome to R2R.
There are lots of us on here to help so keep asking questions.
 
Thank you both for your replies!

I was under the impression that cuc don't add much to the bioload of a tank. Do you think I've overdone it with them? I was mostly wanting to make sure any uneaten food would be taken care of and not left unfound.

Is one small fish per ~7.5 gallons considered overstocked in the marine world? I grew up with freshwater tanks, and while I know marine needs are higher, I thought this was pretty fair. I did plan to stop where I am with fish, but it just felt a bit empty with only the two clowns. I also noticed the ammonia beginning to return before I added the bangaii cardinals, though I'm sure they didn't help the situation.


The faulty test results idea is interesting, I hadn't considered that. Any idea how that could happen? Contamination in the bottles or something? Or something in the tank reading as ammonia that isn't? Would you recommend I go buy a new test kit and see if I'm still having the same readings?
I think your bioload should be just fine.

Hobby grade test kits especially the cheaper ones are known to not be incredibly accurate and are used more as an indicator of things going in the right direction rather than an exact number. From what I know from what I've read over the past 10 years is as long as you were reading nitrites and now nitrates present in the tank your cycle is complete and almost never will ammonia come back. But there are others on these forums with more knowledge than me on this matter.

I would agree with previous poster that in the future you may find your current filtration to not be sufficient and may need something more effecient. But right now I feel confident your tank and it's inhabitants are doing just fine and you shouldn't stress about it.

Also agree with inches of fish per gallons is not the best guide. Rather keep an eye on your livestock and see if they visually looked stress and aggressive with each other. If not you should be good. Your current livestock definitely should not be too much for your tank.

Hope this helps.
 
Welcome to the fishy family! You write very well. That was very detailed. You have done your homework and taken all of the correct steps. I will agree that down the road, the fish may be too much. By then, you will have caught "need a bigger tank" syndrome and moved up. For now, I think your bio is just playing catch up.
I would get a second opinion on your parameters from a LFS that you trust.
 
Thank you all for the responses! You've given me a lot to consider (and helped me calm down a bit. I just really want to do right by my fish). I've already caught some of that "need a bigger tank" syndrome, but am making myself wait. For now the clowns and cardinal fish are getting along swimmingly (sorry), but I will definitely keep an eye out for any signs of developing aggression in the future, especially as the clowns grow!
 
Welcome to R2R! I second adding a bottle of bacteria. It can't hurt either way. Get more rocks in. Those are your bio filter. At least 10 more pounds. Be patient and don't add any fish for a while. The tank you have will sustain them it just needs to be broken in a little more. I'd get some salifert kits. Everyone seems to have trouble with API
 
Hey, I thought I would throw in a quick update in case anyone is curious or in a similar situation and wondering how mine turned out. I did order the Salifert ammonia test kit, but before it arrived my ammonia levels crashed back down to zero, within a couple days. Happy to say they've stayed steady there. The system seems to have stabilized pretty well. I've since drastically upgraded the size of my HOB filter. All animals seem to be happy and thriving. I couldn't be happier with my first salt water tank. Thanks all for the advice and reassurance!
 

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